A Study on The Carriers Compound Multi-Stage MBBR Biological Treatment Process for Domestic Sewage

Biocarriers are a key factor in moving bed biofilm reactors (MBBR) for domestic wastewater treatment and studies targeting biocarriers can be explored in more depth. In this study, two different types of biocarriers, namely anaerobic microbial carriers (AMC) and porous biogels (PBG), were used to tr...

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Bibliographic Details
Published in:Sustainability 2023-05, Vol.15 (10), p.7922
Main Authors: Li, Miaojie, Liu, Yonghong, Zhou, Xiaode, Wang, Ning, Yuan, Bo
Format: Article
Language:English
Subjects:
Activated carbon
Activated sludge
Ammonia
Anaerobic microorganisms
Bacteria
Biofilms
Biological activity
Biological treatment
Bioreactors
Composite materials
Domestic wastewater
Efficiency
Environmental degradation
Household wastes
Load distribution
Loading rate
Microorganisms
Microscopy
Moving beds
Next-generation sequencing
Organic loading
Polyvinyl alcohol
Production processes
Purification
Reactors
Room temperature
Scanning electron microscopy
Sewage
Sludge
Startups
Sustainability
Thermal pollution
Wastewater
Wastewater treatment
Water quality
Water treatment
Water treatment plants
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Summary:Biocarriers are a key factor in moving bed biofilm reactors (MBBR) for domestic wastewater treatment and studies targeting biocarriers can be explored in more depth. In this study, two different types of biocarriers, namely anaerobic microbial carriers (AMC) and porous biogels (PBG), were used to treat real domestic wastewater and acted on a lab-scale tertiary MBBR system. The effects of the start-up process, water quality degradation, secondary start-up, and organic loading rate (OLR) on MBBR performance at room temperature (19–24 °C) and the same filling ratio (40%) were investigated, as well as the calculation of sludge yield. The results showed that the AMC–PBG/MBBR biological treatment process could complete the start-up process quickly in a short time and the OLR was finally determined to be 1.5 kgCOD/(m3·d). In this case, the system was able to operate stably and complete the secondary start-up relatively quickly, with 80% and 95% removal of COD and NH4+-N, respectively. The biofilm was characterized by scanning electron microscopy (SEM) and high-throughput sequencing which revealed the changes of microorganisms in the biofilm during operation, among which the dominant phyla were Euryarchaeota and Proteobacteria. Finally, the apparent production of process sludge was monitored and calculated to be 0.043 kgMLSS/kgCOD which is a significant reduction in sludge compared to the conventional activated sludge method. These conclusions provide valuable information for the full-scale treatment of domestic wastewater.
ISSN:2071-1050
2071-1050
DOI:10.3390/su15107922